Biomedical subjects

Kazuhiro Tsuchiya

Publications and source records attributed to Kazuhiro Tsuchiya.

22 records · Page 2Linked to original sources

PubMed2002

Magnetic resonance imaging of lymphomatoid granulomatosis: punctate and linear enhancement preceding hemorrhage.

Lymphomatoid granulomatosis (LG) is an angiocentric and angiodestructive lymphoproliferative disease that mainly involves the lung. Thirty percent of patients with LG have neurological symptoms. We report serial changes in MRI of a patient with LG of the brain. Postcontrast MRI demonstrated multiple punctate and linear areas that preceded hemorrhage, as indicated by hypointensity with surrounding hyperintensity on subsequent T2-weighted images. The diagnostic value of these lesions observed with contrast MR images is discussed. We consider that enhancing areas correspond to walls of small vessels affected by LG.

Adult↗

PubMed2002

MR-angiogram-added surface anatomy scanning of superficial cerebral arteriovenous malformations.

Our purpose was to evaluate the utility of surface anatomy scanning (SAS) of the brain with superimposition of MR angiograms in the diagnosis and presurgical planning of superficial cerebral arteriovenous malformations (AVMs). We performed SAS in 15 patients with superficial cerebral AVMs. Two-dimensional phase-contrast MR angiograms were then obtained in the same section and superimposed on the SAS images. The images were assessed regarding the visualization of each AVM component using a four-point grading scale (3=excellent to 0=poor). In 13 of the patients, the assessment was made comparing with conventional angiograms. The images were also compared with the surgical findings in 5 patients. The added images agreed well with the angiographic findings and demonstrated the relationships between the AVM components and the adjacent brain surface. The average scores of the feeder(s), nidus, and drainer(s) were 2.27, 2.33, and 2.67, respectively. The surgical findings also correlated well with the added images. Our technique can noninvasively demonstrate superficial AVMs along with the brain surface and provide information useful for planning surgery.

Adult↗

PubMedDate not supplied

Visualization of extracranial-intracranial bypass using multidetector-row helical computed tomography angiography.

PURPOSE: The advent of multidetector-row computed tomography (MDCT) has enabled images with good spatial resolution to be obtained over a wide range in a short scanning time. Our purpose was to determine whether CT angiography using the MDCT system could effectively depict extracranial-intracranial (EC-IC) bypass routes. METHOD: Helical CT angiography was performed using an MDCT scanner in 12 patients who had undergone EC-IC bypass surgery: 10 patients had undergone superficial temporal artery-middle cerebral artery (MCA) anastomosis, 1 patient had undergone an encephaloduroarteriosynangiosis procedure for the treatment of moyamoya disease, and 1 patient had undergone an external carotid artery-MCA anastomosis using a graft. The resulting CT angiograms were visually evaluated for their depiction of the EC-IC bypass route. Conventional angiograms were available for comparison in all 12 patients. RESULTS: The EC-IC bypass was visualized to be patent at the site of anastomosis in all 12 patients. Branches of the MCA secondary or more to those connected to a donor artery were demonstrated in 9 patients, whereas MCA branches immediately distal to the anastomosis were demonstrated in 3 patients. The CT angiography findings corresponded well with the conventional angiography findings in all patients. CONCLUSION: Helical CT angiography using the MDCT technique is an effective method for visualizing EC-IC bypass routes.

Adult↗

PubMedDate not supplied

Case report: spinal cord infarction demonstrated on diffusion-weighted MR imaging with a single-shot fast spin-echo sequence.

We describe the diffusion-weighted (DW) MR imaging findings in three cases of spinal cord infarction using a recently developed single-shot fast spin-echo (SSFSE) technique. The SSFSE-DW MR images, which were obtained 20 hours, 3 days, and 18 days, respectively, after the ischemic event, demonstrated conspicuous areas of hyperintensity in the affected portions. Follow-up DW MR images, obtained in two of the patients at 17 days and 3 months, respectively, showed persistent decreased apparent diffusion coefficient values. SSFSE-DW imaging of the spinal cord may provide additional information for assessment of ischemic changes.

Aged↗